Piano lock



F. WMIX.

(No Medal.)

PIANO LOOK.

Patented Mar. 18, 1884,

yWMiQ V. I

N. PEIERS. ?nn(o-Ulhngndwr. wmhen ann. 0. c.

plate; G, the cap, and D the keeper.

FRANK W. MIX, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE CORBIN CABINET LOCK COMPANY, OF SAME PLACE.

PIANO-LOCK.

SPECIFICATION forming part of Letters Patent No. 295,270, dated March 18, 1884.

Application filed January 2, 1884.

I0 all whom it 11mg; concern.-

Be it known that I, FRANK W. MIX, acit-izen of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, haveinvented certain new and useful Improvements in Locks, of which the following is a specification.

My invention relates to improvements in self-locking locks for desks and other furniture; and the objects of my improvement are to simplify the construction of the lock and to increase its strength and efficiency. I attain these objects by thev construction illusstrated in the accompanying drawings, in which' Figure 1 is a front elevation of my lock with the cap removed, and Fig. 2 is a vertical sec tion of the complete lock on line as :0 of Fig. 1.

A designates the face-plate; B, the lock- The swinging dogs or hooks a. a are arranged in pairs upon thesides of thekey-holeb,as shown,

and are pressed upon by springs c with a constant tendency to throw the hooked ends cl, Fig.

1, outward. Only one pair of these dogs is necessary; but greater security against picking is aiforded by the employment of more than one pair placed one over the other, after the manner of several tumblers. Locks hav ing such dogs are quite common. Instead, however, of making the hooked ends of these dogs the only part that projects through the stationary face-plate A, I place these dogs in a housing, which I term the hollow bolt E. This bolt is made of a size to enter and properly fill the hole in the keeper D, and its corners should be beveled or rounded off a little, to facilitate the entry of the bolt within the keeper in closing the lid of the box or case to which the lock is applied. The edges of the bolt are left open, so that the hookcdends d, Fig. 1, can project therefrom and take under the inner face of the keeper, as shown. As before stated, the dogs which I place in this hollow bolt are ordinary lock mechanism, and other ordinary lock mechanism which will throw projections from the edge of the bolt may be substituted therefor without departing from the nature of my invention.

The construction hereinbefore described can be made by pivoting the dogs directly to the (No model.)

lock-plate B. A convenient form of construc tion is to make the bolt E of sheet metal, bent as shown mostclearly in Fig. 2, with one arm long enough to form the plate 6. The dogs can be pivoted to said plate entirely inde pendent of thelock-plate B, and the bolt, dogs, and springs properly fitted and completed. .This complete locking mechanism may be secured to the lock-plate B by merely passing the bolt through the proper hole in the face plate A and securing the plate 6 to the plate B by means of one or more rivets, 9.

By the foregoing construction I produce a seltlocking lock in which the ends of the dogs are completely protected from any bending or wrenching strain either in enteringthe keeper in closing the lid or afterward, because such strain is received by the stationaryhollow bolt E. The bolt also cuts off access to the springdogs of a picking-tool inserted between the face-plate and the keeper.

I am aware that a prior patent, No. 48,209, shows a lock having spring-dogs housed in a hollow bolt or slide, saidslidehavingatoothed rack, so that it could be thrown out and in by means of a pinionshaped key, and the dogs having inclines or cams,which are acted upon by a moving part to force the dogs inward as the bolt is thrown into and out of the lockcase, and I hereby disclaim the same. My lock differs from this prior lock by being selflocking. by having the lock mechanism operated by direct action ofthe key upon the springdogs themselves, instead of upon the bolt in which they are housed, and also operated independent of any movement of the bolt; also, in the fact that the stationary bolt of my lock enters the keeper and protects the spring-dogs during the closing ofthe desk or box 1id,while in the lock disclaimed the spring-dogs are unprotected while entering the keeper, and the hollow bolt or slide does not enter the keeper until after the box or desk lid has been closed and a proper key applied to throw said bolt; and, further, in the fact that the spring'dogs of said prior lock would be inoperative if pivoted to the hollow bolt, as specified in my second claim.

I claim as my invention- 1. The combination of the stationary hollow bolt and inclosed spring-pressed locking mechanism adapted to be operated byakey applied B, substantially as described, and for the purdirectly thereto, and having projeciions for pose specified. I projecting from the edges of said bolt, which I 8. A self-locking look having a stationary are thrown outward in looking by means of the hollow bolt projecting from the face-plate, and I5 5 springs, substantially as described, and for the I the lockingineehanism partiallyinclosedwit11- purpose specified. in said projecting end, substantially as de- 2. Alock consisting of the stationary hollow scribed, and for the purpose specified. bolt having the plate 6, formedby an extension FRANK \V. MIX. of one of its sides, the locking mechanism se- WVitnesses: p

I I0 cured to said plate 6, the face-plate, andlock- E. L. PRIOR,

plate B, with the plate esecured to said plate S. G. DUNHAM. 

